Home / 21,988.28-30,343.84-11,916.80

Finding the Fourth Proportional to 21,988.28, 30,343.84 and 11,916.80

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Solution

The fourth proportional to 21,988.28, 30,343.84 and 11,916.80 is: 16,445.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.28 : 30,343.84 = 11,916.80 : x
  2. Step 2: Convert to fraction form
    21,988.28/30,343.84 = 11,916.80/x
  3. Step 3: Cross multiply
    21,988.28x = 30,343.84 × 11,916.80
  4. Step 4: Simplify right side
    21,988.28x = 361,601,472.51
  5. Step 5: Solve for x
    x = 361,601,472.51/21,988.28
  6. Step 6: Final answer
    x = 16,445.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.